In summary, modern Europeans are a product of three closely-related races and two major migrations, both of which brought huge cultural and technological revolutions. In modern terms, these migrations would be biologically comparable to Chinese intermixing with Japanese, or Saudis intermixing with Libyans, or something like that. They were in no way comparable to present-day mass migration of non-White peoples into European lands — as the media often attempts to spin.
I’m mainly including this appendix entry as a preemptive response to people who claim that “White people will never go extinct.” Multiple Indo-European races have already gone extinct. The most notable examples include:
Anatolian races, such as the Hittites and Luwians.
Indo-Aryan Mittani and Kassites of the Middle East; who were assimilated into local populations, as they formed a ruling class of foreign elites.
Indo-Europeans of East Asia, whose territory almost reached Beijing, such as the Tocharians, Yuezhi, Wusun, and Ordos peoples; most of whom were assimilated into Turkic and Hunnic populations, through conquest as well as peaceful intermixing. Some were genocided by the Chinese.
Iranians of Central Asia, such as the Scythians, Saka, Sogdians, and Bactrians; most of whom were turned into hapas by Turkic expansion. Western Scythians were absorbed into Slavic populations and, since both groups were basically the same race, that probably doesn’t count as biological extinction, but cultural. Either way, the Scythian way of life ceased to exist.